Electrical Machines Which of following DC motors will have percentage increase of input current for the same percentage increase in torque? Cummulative compound. Shunt. Series. Differntical compound. Cummulative compound. Shunt. Series. Differntical compound. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is 2.2 Ω 6 Ω 5.7 Ω 1.9 Ω 2.2 Ω 6 Ω 5.7 Ω 1.9 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature resistance control method is used for the _______ ? both 1 and 2 None of these below rated speed above rated speed both 1 and 2 None of these below rated speed above rated speed ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What will be the eddy current loss if the supply frequency of a transformer becomes double? Four times. Doubled. Eight times. Remains same. Four times. Doubled. Eight times. Remains same. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What happens if fifth multiples of harmonics is given to induction motor? It will rotates in reverse direction. Either short circuit or open circuit occurs. Fail to start. It will rotates in normal operation. It will rotates in reverse direction. Either short circuit or open circuit occurs. Fail to start. It will rotates in normal operation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Number of tappings for each equalizer ring is equal to number of poles. number of commutator segments. number of pole pairs. number of parallel paths. number of poles. number of commutator segments. number of pole pairs. number of parallel paths. ANSWER DOWNLOAD EXAMIANS APP
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